cones medical definition
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- Medical Definition of Cone. Cone: A type of specialized light-sensitive cell (photoreceptor) in the retina of the eye that provides color vision and sharp central vision. By contrast, the rods are the retinal photoreceptors that provide side vision and the ability to see objects in dim light (night vision). Search MedTerms:
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Visible spectrum The visible spectrum is a very small portion of the electromagnetic spectrum that can be seen by human eyes. This is shown in the figure below, which is not to scale.The exact boundaries of each type of wave are not precisely defined and often different authors have slightly different values.he limit between ionizing and non-ionizing radiations is located somewhere in the UV region, but it's not clearly defined and somehow fuzzy. A photon energy of 10 eV (corresponding to 124 nm) is often considered the threshold between ionizing and non-ionizing radiation, but there is no consensus on this topic.
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clear Medical Definition of clear. 1  1: to render (a specimen for microscopic examination) transparent by the use of an agent (as an essential oil) that modifies the index of refraction. 2  2: to rid (the throat) of phlegm or of something that makes the voice indistinct or husky.
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- Rods are responsible for night peripheral vision. Cones produce color and central vision. The wide, cone-shaped cells of the retina are sensitive to light. In bright environments, the chemical iodopsin increases in the cones. They become more sensitive, and we can see greater detail and color.
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cone 4. in root canal therapy, a solid substance with a tapered form, usually made of gutta-percha or silver, fashioned to conform to the shape of a root canal. cone of light the triangular reflection of light seen on the tympanic membrane.
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cone a solid whose surface is generated by a line passing through a fixed point and a fixed plane curve not containing the point, consisting of two equal sections joined at a vertex. a plane surface resembling the cross section of a solid cone.
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- Medical Definition of NEGATIVE. 1. 2. 3. a: being, relating to, or charged with electricity of which the electron is the elementary unit (2) : being the electron-emitting electrode of an electron tube. 4. 5.
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cone 4. Physiology One of the photoreceptors in the retina of the eye that is responsible for daylight and color vision. These photoreceptors are most densely concentrated in the fovea centralis, creating the area of greatest visual acuity. Also called cone cell.
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bipolar neuron A neuron that has two processes arising from opposite poles of the cell body. 1. A neuron that bears two processes. 2. A neuron of the retina that receives impulses from the rods and cones and transmits them to a ganglion neuron. See: retina for illus.
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- Medical Definition of prism. 1  1: a polyhedron with two polygonal faces lying in parallel planes and with the other faces parallelograms. 2  2: a transparent body that is bounded in part by two nonparallel plane faces and is used to refract or disperse a beam of light.
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stigma stigma. 1. any mental or physical mark or peculiarity that aids in identification or diagnosis of a condition. 2. a mark, spot, or pore on the surface of an organ or organism.3. follicular s. 4. a distinguishing personal trait that is perceived as or actually is physically, socially, or psychologically disadvantageous.. a mark, spot, or pore on the surface of an organ or organism. 3. follicular stigma. 4. in botany, the uppermost part of a pistil, which secretes a moist, sticky substance to trap and hold the pollen that reaches it.
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blind spot blind spot. 1. Anatomy. a small area on the retina that is insensitive to light due to the interruption, where the optic nerve joins the retina, of the normal pattern of light-sensitive rods and cones. 2. I confess that operettas are my blind spot.
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- Medical Definition of tone–deaf. : relatively insensitive to differences in musical pitch.
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How to Reheat Pizza How to Reheat Pizza. Bring limp, lifeless leftover pizza back to crispy, delicious life! See Chef John’s foolproof stovetop method for reheating leftover pizza so it comes out with tasty melted cheese on top and a perfectly crisp crust on the bottom (crispier than the toaster-oven method). It’s a fast method, too—no waiting around for the oven to preheat.
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magnetic Medical Definition of magnetic. 1  1: of or relating to a magnet or to magnetism. 2  2: of, relating to, or characterized by the earth's magnetism. 3  3: magnetized or capable of being magnetized.  4: actuated by magnetic attraction.
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- Rods are a part of the eye that takes in low light. Cones are  located in the retina and they are responsible for seeing in color.  All mammals have rods and cones in their … eyes. 1 person found this useful.
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Blind spot Blind spot. Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.
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- Any of various trees or shrubs that bear cones. Conifers are dependent on the wind to blow pollen produced by the male cones to the female cones, where seeds develop. Conifers are usually evergreen, often have needle-shaped or scale-like leaves, and include the pine, fir, spruce, hemlock, and yew.
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- Definitions: 1. the tapering lower extremity of the spinal cord. Synonyms: medullary cone. The definition information for conus medullaris is provided by Stedman's.You can search our medical dictionary here.. the tapering lower extremity of the spinal cord. Synonyms: medullary cone. The definition information for conus medullaris is provided by Stedman's.
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- 1. 1  Anatomy. a small area on the retina that is insensitive to light due to the interruption, where the optic nerve joins the retina, of the normal pattern of light-sensitive rods and cones. 2  an area or subject about which one is uninformed, prejudiced, or unappreciative: 3  dead spot (def 1).
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- Rods and Cones. show/hide words to know. 1  Cornea: is the clear outer surface of the eye the covers the iris, pupil, and the outer chamber of the eye... 2  more. 3  Epithelium: the layer of cells found lining the surface of most surfaces of the body. 4  Epithelium is one of four types of tissues found in human body.
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OSHA's Revised Injury and Illness Recordkeeping Rules [29 CFR 1904] Employers must record each case on the OSHA 300 Log and the Form 301 Incident Report within seven (7) calendar days after being notified that an injury or illness occurred. For each case, employers must check one of the following injury/illness categories on the OSHA 300 Log.
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- Medical Definition of QUANTITATIVE. 1. : of, relating to, or expressible in terms of quantity. 2. : of, relating to, or involving the measurement of quantity or amount. — quan·ti·ta·tive·ly adverb.
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- Medical Definition of locus. plural. loci. \ˈlō-ˌsī, -ˌkī also -ˌkē\play play play. 1: a place or site of an event, activity, or thing the integrity of the tissues determines the extent and locus of the damage—Sylvia E. Hines. 2: the position in a chromosome of a particular gene or allele.
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indication medical specialty, medicine - the branches of medical science that deal with nonsurgical techniques. indication - (medicine) a reason to prescribe a drug or perform a procedure; the presence of bacterial infection was an indication for the use of antibiotics.
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- Medical Definition of QUANTITATIVE. 1. : of, relating to, or expressible in terms of quantity. 2. : of, relating to, or involving the measurement of quantity or amount.